Heat exchanger



June 29 J; LE VALLEY HEAT EXCHANGER Filed Dec. 1 1925 2 Sheets-Sheet 1 mm V w.

June 29 1926. 1,590,247

J. LIE VALLEY HEAT EXCHANGER.

Filed Dec. 1, 1925 2 Sheets-Sheet 2 IN VEN TOR (gal el lle BY Z Elsi?RNEX Patented June 29, 1926.

iii il'lh. STATS Arsa'rcrric JOHN LE VALLEY, OF PAINTED POSQ NEW YORK,ASSIG'NOB TO INGERSOLL RAND COMPANY, OF JERSEY CITY, NEW JERSEY, ACORPGRATION OF NEW JERSEY.-

HEAT nxonanenn.

Application filed December This invention relates to heat exchangeapparatus and more particularly to devices for cooling air betweenstagesof compression. Although features of the invention are adapted for usein general applications,

the invention possesses special advantages when embodied in auxiliaryair coolingapparatus in combination, with other coolers.

It is an object of this invention to provide a cooler in which the airpassage is entirely surrounded by a water passage, and to providebaflles which are themselves water cooled for the purpose of repeatedlydirecting the air against water cooled surfaces.

In former coolers the outer shell is not water cooled nor are thebattles. Where such a cooler is placed in a warm engine room, as isfrequently the case, it often occurs that the inter-stage air afterbeing cooled somewhat below the temperature of the engine room, willabsorb as much heat through the unjacketed shell as the water cooledsurfaces inside can extract, so that further reduction of theinter-stage air temperature is impossible. However, in the new coolerherein described, the low temperature of the air which may be obtainedis limited only by the temperature of the available water.

Qther objects and advantages of the in vention will be in part obviousand in part pointed out hereinafter.

In the drawings in which similar reference characters refer to similarparts,

Figure 1 is a vertical section through a compressor, its inter-coolerand auxi iary cooler constructed in accordance with the practice of theinvention,

Figure 2 is a cross-section through an auxiliary cooler taken along theline 22 looking in the direction of the arrows, and

Figure 3 is a horizontal section through the auxiliary cooler takenalong the line 8-3 looking in the direction of the arrows.

Referring to the drawing, a compressor A shown in cross section having apiston B is provided with an inlet chamber C and a discharge chamber Dseparated by suitable webs E. The compressor cylinder A in this case isthe second stage cylinder of a two stage compressing apparatus, thefirst or low pressure cylinder not being shown. The first stage cylinderis adapted to discharge air into a suitable inter-cooler F which may beof the tubular type in which the tubes G for conducting cooling waterare sealed in a tube 1, 1925. Serial No. 72,538.

sheet H at either end of the outer shell J.

For economy of space the inter-cooler F is mounted overhead, beingsupported by a flanged pipe K bolted to a boss L of the cyl-L inder A. v

In order to effect the desired cooling, an auxiliary cooler. is providedwhich is adapted to be attached to a boss 0 at the discharge end of theinter-cooler F. The auxiliary cooler comprises an outer shell Pprovidedwith an air passage Q preferably cast integrally with the outer shell P.The air passage Q is annular in cross section (Figure 1) and leads froman open chamber R at the upper end of the casing or shell P to a chamberS at the bottom of said casing.

The open ended chamber R is provided With a flange T by which the coolerF is attached to the auxiliary cooler. At the lower end of the auxiliarycooler at the chamber S there is likewise provided a flange WV forconnection with the cylinder A at the inlet pocket 0 at a boss Y. Theair passing from the cooler F enters the auxiliary cooler at the upperinlet chamber R and passing through the passage Q, to the dischargechamber S leaves the auxiliary cooler at the flanged portion W to befurther compressed in the cylinder B.

The space about the passage Q, is arranged to be filled with coolingwater which is adapted to be supplied from a pipe I) at the lower end ofthe shell P and conducted through a tubular extension 0 of the walls ofthe passage Q. The water, after passing through the length of theauxiliary cooler in the space within the shell P surrounding the passageQ, is adapted to be discharged from the auxiliary cooler into a pipedthreaded into a tapped hole'in the top of the outer shell P. Theauxiliary cooler is of the counter flow type and is preferably suppliedwith the coolest water available for cooling the air passingtherethrough.

The water may be reused by connecting the pipe cl with the supply pipeof the intercooler F.

The air passing through the chamber Q, is additionally cooled by acentral member 7 made hollow to conduct water which insures contact ofthe air with a cooling surface. Furthermore a serpentine path for theair is secured by the provision of water cooled alternately locatedhollow baflies g.

It will be noted that every wall or baffle with which the air contactsis adapted to absorb heat from the air, to assist its cooling.

To facilitate the making of the auxiliary cooler and also to makecleansing of'the water passages withinthe shell P possible, suitablehand holes 0 are provided at convenient intervals on the outside of theshell P and are normally closed bycovers p bolted in place. v

I claim: I

1. An auxiliary cooler, comprising three spaced concentric conduits,hollow semi-circular staggered baiile plates extending from the innerconduit to the outer conduit and allowing communication between saidouter and inner conduits, inlet and outlet means positioned to allow thecirculation of the cooling fluid through the outer and inner conduits,and an air inlet and outlet to the intermediate conduit.

2. An auxiliary cooler, comprising three spaced-concentric cylindricalwalls forming conduits, semi-annular baffles being formed of two spacedmembers positioned in staggered' relationship to each other between thespecification.

JOHN LE VALLEY.

